Prebid.js is the open source framework that allows sites (also known as "publishers") to connect external advertiser demand to their ad inventory.
The sincera engine crawls 84,281 of the top websites, with 27,117 indicating they are running prebid. 23,450 are running the latest major version of Prebid, indicating that 86.5% of sites are on the latest major version of Prebid.
Note that there are many forks of Prebid that restrict some form of functionality (Prebid API access) so this should be considered a conservative number.
This chart provides a view into the total number of publishers on each minor version of Prebid.
As Open Source software, Prebid plays a vital royal in the digital advertising ecosystem, as standardizes and maintains a path to advertiser demand for sites outside of the closed platforms (also known as "walled gardens") of Google, Facebook and Amazon.
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